code: def test_import_nothing():
      """Not importing imageio should not import any imageio modules."""
      modnames = loaded_modules("os", 2)
      assert modnames == set()
  
file_path: imageio/tests/test_meta.py
imports: from __future__ import print_function
  import os
  import sys
  import subprocess
  from pytest import raises
  import imageio
label_desc: Use image node_id 4 for calling a global function with example usage: test_import_nothing() without return types